So can't get Rhythmbox to work with madsonic DLNA Server i decided to switch over to Clementine With Clementine's build in support for subsonic i was able to log in to my madsonic server - beneath upnp. So if someone will find another solution with grilo-plugins enabled - please tell me.

Did you mind to change another software to convert your audiobooks? If you are looking for an easy and practical program to batch convert audiobooks, you can have a try with AudFree DRM Audio Converter , which also can convert audiobook to m4b losslessly. I'm an audiobooks lover, it's work well for me.